Cutter-head



llnrrnn STATES it SAMUEL J. SHIMER, OF MILTON, PENNSYLVANIA.

CUTTER-HEAD.

SPECIFICATION forming part of Letters Patent No. 603,976, dated May 10,1898.

Application filed October 4,- 1897.

To all whom it may concern:

Be it known that LSAMUEL J. SHIMER,a citizen of the United States, and aresident of Milton, in the county of Northumberland and State ofPennsylvania, have invented certain new and useful Improvements inTrapezoidal Cutter-Heads; and I do hereby declare that the following isa full, clear, and exact description of the invention, which will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, which form apart of this specification.

My invention relates to trapezoidal cutterheads for woodworking machinessuch as shown in the reissued Letters Patent granted to me the 29th dayof June, 1897, Nos. 11,616 and 11,617, in which the sides arealternately arranged and alternately inclined inwardly and outwardlywith respect to the axial line of the head. Such heads are formed withoutwardly-projecting chip-breaks at the front ends of the knife-seats,which are also alternatel y arranged and alternately inclined withrespect to the axial line of the head. In practice said chip-breaks wearaway in the course of time and the knives require to be frequentlysharpened, so that it is extremely difficult to adjust the knives orcutters so that the cutting edges will be in proper position withrespect to the head. The object of the present invention is to providean improved construction of such cutter-heads whereby a gage maybeapplied thereto to adjust the cutting edges of the knives.

The invention consists, essentially,in a trapezoidal cutter-head formedwith shoulders which are parallel or coincident with the chipbreaks andwhich form abutments for a gage, as hereinafter fully described andclaimed.

In the accompanying drawings, Figure 1 is a perspective view of a squarecutter-head constructed in accordance with my invention. Fig. 2 is asimilar view of the same, showing a knife bolted thereto and a gageapplied. Fig. 3 is an elevation showing the gage. Fig. 1 is a plan view,on a reduced scale, of the cutter-head.

In the said drawings the reference-numeral 1 designates a trapezoidalcutter-head formed with a central hole 2 for the passage of the spindleor mandrel by which it is rotated.

Serial No. 654,044. (No man.)

This cutter-head is formed with four knife seats or faces 3, alternatelyarranged and alternately inclined with respect to the axial line of thehead and each having a chip-break 1 at the front end, which chip-breaksproject beyond the faces of the head. Near the rear end each of saidseats or faces is formed with a longitudinal shoulder or straight-edge5,parallel with the chip-break. These chip-breaks follow the lines ofthe head-that is to say, they are oblique to.the plane of rotation andthe shoulder in rear of each chip-break is parallel or coincidenttherewith.

The numeral 6 designates a gage which can be used in connection with theknife and cutter-head, comprising a metal plate cut away at one edge,forming an arm 7, having a notch 8 in its lower edge. Opposite this armis a shoulder 9, and in rear thereof is a lug 10.

The numeral 12 designates the knives or cutters, formed at the rear endswith slots 13 for the passage of headed bolts 14, which engage withT-slots 15 in the head. The numerals 16 and 17 designate washers andnuts on said bolts.

In practice the knives are bolted loosely down upon their seats, so thatthey can be moved in and out in order to adjust them. The gage is thenapplied to the knife with the notch 8 in the arms 7 engaging with theshoulder or straight-edge 5. By now moving or adjusting the knife sothat its cutting edge will contact with the lug 10 of the gage theproper position of the cutting edge with respect to the axial line ofthe head will be determined. As before stated, the chip-breaks aresubject to wear; but the shoulder or straight-edge retains its shape oroutline permanently.

It will be seen that the chip-breaks are not parallel with each othernor with the axial line of the head, so that the shoulder parallel withone chip-break will be at an angle to the next adjoining chip-break.

Having thus fully described my invention, what I claim is 1. As animproved article, a trapezoidal cutter-head formed with knife seats orfaces formed with chip-breaks, beveled on the under side and alternatelyarranged and alter nately inclined with respect to the axial line of thehead, the shoulders formed integral with said head in rear of thechip-breaks and each shoulder parallel or coincident with the chip-breakin front thereof, and extending from end to end of the head, forming anabutment for a gage, substantially as described.

2. As an improved article, a cutter-head formed with knife seats orfaces extending from end to end of the head and each formed with achip-break alternately arranged and alternately inclined inwardly andoutwardly with respect to the axial line of the head, and said headsformed with T-slots intermediate the front and rear limits of theknife-seats, the longitudinal shoulders each of which is parallel orcoincident with the chip-break in rear of which it is located,but at anangle to the next succeeding chip-break, and said shoulders integralwith said head and extending from end to end thereof, forming abutmentsfor a gage, substantially as described.

In testimony that I claim the foregoing as my own I have hereuntoaffixed my signature in presence of two witnesses.

SAMUEL J. SHIMER.

Witnesses;

W. H. BECK, JOHN A. BECK.

